Set client keytab location for 389ds

Handles behavior change in
https://github.com/389ds/389-ds-base/pull/4523

Fixes: https://pagure.io/freeipa/issue/8656
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

install/share/ds-ipa-env.conf.template

@@ -3,4 +3,5 @@
 [Service]
 Environment=LC_ALL=C.UTF-8
 Environment=KRB5_KTNAME=$KRB5_KTNAME
+Environment=KRB5_CLIENT_KTNAME=$KRB5_KTNAME
 Environment=KRB5CCNAME=$KRB5CCNAME